Modifiers matching bivalve:

• important,
• commercial,
• common,
• small,
• marine,
• fixed,
• native,
• tidal,
• sessile,
• intertidal,
• open,
• smaller,
• aquatic,
• large,
• edible,
• natural,
• cultured,

Simple categories matching tidal:

• structure,
• feature,
• process,
• wave,
• tree,
• organism,
• creature,
• event,
• bivalve,
• bay,
• invertebrate,
• distortion,